Abstract
A dual-band bandpass filter with dual coupling paths is presented in this work. The filter is formed of two dual-mode patch resonators, one half-wavelength or full-wavelength straight-line resonator and a hair-pin resonator. The patch resonators act as a signal splitter, combiner and resonant pole in the dual-band bandpass filter. The patch resonators are coupled with the hair-pin and the straight-line resonators. Two dual-band filters with different transmission zeros have been designed, simulated and tested. The effect of the variation of the dielectric constant has been studied.
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